Milwaukee 2780-20 User manual

Brand: Milwaukee

Model: 2780-20

Category: Power tools

Type: User manual

Cat. No. / No de cat.

2780-20, 2781-20

M18™ FUEL™ 4-1/2" / 5" GRINDER

MEULE DE 115 / 127 mm (4-1/2" / 5") M18™

AMOLADORA 115 / 127 mm (4-1/2" / 5") DE M18™

OPERATOR'S MANUAL

MANUEL de L'UTILISATEUR

MANUAL del OPERADOR

WARNING To reduce the risk of injury, user must read and understand operator's manual.

AVERTISSEMENT An de réduire le risque de blessures, l'utilisateur doit lire et bien

comprendre le manuel.

ADVERTENCIA Para reducir el riesgo de lesiones, el usuario debe leer y entender el manual.

GENERAL POWER TOOL

SAFETY WARNINGS

WARNING

Read all safety warnings, instruc-

tions, illustrations and specica-

tions provided with this power tool. Failure to

follow all instructions listed below may result in

electric shock, re and/or serious injury. Save all

warnings and instructions for future reference.

The term "power tool" in the warnings refers to your

mains-operated (corded) power tool or battery-oper-

ated (cordless) power tool.

WORK AREA SAFETY

• Keep work area clean and well lit. Cluttered or dark

areas invite accidents.

• Do not operate power tools in explosive atmo-

spheres, such as in the presence of ammable

liquids, gases or dust. Power tools create sparks

which may ignite the dust or fumes.

• Keep children and bystanders away while operat-

ing a power tool. Distractions can cause you to lose

control.

ELECTRICAL SAFETY

• Power tool plugs must match the outlet. Never

modify the plug in any way. Do not use any

adapter plugs with earthed (grounded) power

tools. Unmodied plugs and matching outlets will

reduce risk of electric shock.

• Avoid body contact with earthed or grounded

surfaces, such as pipes, radiators, ranges and

refrigerators. There is an increased risk of electric

shock if your body is earthed or grounded.

• Do not expose power tools to rain or wet condi-

tions. Water entering a power tool will increase the

risk of electric shock.

• Do not abuse the cord. Never use the cord for

carrying, pulling or unplugging the power tool.

Keep cord away from heat, oil, sharp edges or

moving parts. Damaged or entangled cords increase

the risk of electric shock.

• When operating a power tool outdoors, use an

extension cord suitable for outdoor use. Use of

a cord suitable for outdoor use reduces the risk of

electric shock.

• If operating a power tool in a damp location is

unavoidable, use a ground fault circuit interrupter

(GFCI) protected supply. Use of an GFCI reduces

the risk of electric shock.

PERSONAL SAFETY

• Stay alert, watch what you are doing and use

common sense when operating a power tool. Do

not use a power tool while you are tired or under

the inuence of drugs, alcohol or medication. A

moment of inattention while operating power tools

may result in serious personal injury.

• Use personal protective equipment. Always wear

eye protection. Protective equipment such as a dust

mask, non-skid safety shoes, hard hat or hearing

protection used for appropriate conditions will reduce

personal injuries.

• Prevent unintentional starting. Ensure the switch

is in the off-position before connecting to power

source and/or battery pack, picking up or carrying

the tool. Carrying power tools with your nger on the

switch or energizing power tools that have the switch

on invites accidents.

• Remove any adjusting key or wrench before

turning the power tool on. A wrench or a key left

attached to a rotating part of the power tool may result

in personal injury.

• Do not overreach. Keep proper footing and bal-

ance at all times. This enables better control of the

power tool in unexpected situations.

• Dress properly. Do not wear loose clothing or

jewelry. Keep your hair and clothing away from

moving parts. Loose clothes, jewelry or long hair

can be caught in moving parts.

• If devices are provided for the connection of dust

extraction and collection facilities, ensure these

are connected and properly used. Use of dust

collection can reduce dust-related hazards.

• Do not let familiarity gained from frequent use

of tools allow you to become complacent and

ignore tool safety principles. A careless action

can cause severe injury within a fraction of a second.

POWER TOOL USE AND CARE

• Do not force the power tool. Use the correct

power tool for your application. The correct power

tool will do the job better and safer at the rate for

which it was designed.

• Do not use the power tool if the switch does not

turn it on and off. Any power tool that cannot be

controlled with the switch is dangerous and must be

repaired.

• Disconnect the plug from the power source and/

or remove the battery pack, if detachable, from

the power tool before making any adjustments,

changing accessories, or storing power tools.

Such preventive safety measures reduce the risk of

starting the power tool accidentally.

• Store idle power tools out of the reach of children

and do not allow persons unfamiliar with the

power tool or these instructions to operate the

power tool. Power tools are dangerous in the hands

of untrained users.

• Maintain power tools and accessories. Check for

misalignment or binding of moving parts, break-

age of parts and any other condition that may

affect the power tool’s operation. If damaged,

have the power tool repaired before use. Many

accidents are caused by poorly maintained power

tools.

• Keep cutting tools sharp and clean. Properly

maintained cutting tools with sharp cutting edges are

less likely to bind and are easier to control.

• Use the power tool, accessories and tool bits etc.

in accordance with these instructions, taking into

account the working conditions and the work to

be performed. Use of the power tool for operations

different from those intended could result in a hazard-

ous situation.

• Keep handles and grasping surfaces dry, clean

and free from oil and grease. Slippery handles

and grasping surfaces do not allow for safe handling

and control of the tool in unexpected situations.

BATTERY TOOL USE AND CARE

• Recharge only with the charger specied by the

manufacturer. A charger that is suitable for one type

of battery pack may create a risk of re when used

with another battery pack.

• Use power tools only with specically designated

battery packs. Use of any other battery packs may

create a risk of injury and re.

• When battery pack is not in use, keep it away

from other metal objects, like paper clips, coins,

keys, nails, screws or other small metal objects,

that can make a connection from one terminal to

another. Shorting the battery terminals together may

cause burns or a re.

• Under abusive conditions, liquid may be ejected

from the battery; avoid contact. If contact ac-

cidentally occurs, ush with water. If liquid con-

tacts eyes, additionally seek medical help. Liquid

ejected from the battery may cause irritation or burns.

• Do not use a battery pack or tool that is dam-

aged or modied. Damaged or modied batteries

may exhibit unpredictable behavior resulting in re,

explosion or risk of injury.

• Do not expose a battery pack or tool to re or

excessive temperature. Exposure to re or tem-

perature above 265°F (130°C) may cause explosion.

• Follow all charging instructions and do not

charge the battery pack or tool outside the

temperature range specied in the instructions.

Charging improperly or at temperatures outside the

specied range may damage the battery and increase

the risk of re.

SERVICE

• Have your power tool serviced by a qualied

repair person using only identical replacement

parts. This will ensure that the safety of the power

tool is maintained.

• Never service damaged battery packs. Service

of battery packs should only be performed by the

manufacturer or authorized service providers.

SPECIFIC SAFETY RULES FOR

GRINDERS

Safety Warnings Common for Grinding, Sanding,

Wire Brushing or Abrasive Cutting-Off Operations:

• This power tool is intended to function as a

grinder, sander, wire brush or cut-off tool. Read

all safety warnings, instructions, illustrations and

specications provided with this power tool. Fail-

ure to follow all instructions listed below may result

in electric shock, re and/or serious injury.

• Operations such as polishing are not recom-

mended to be performed with this power tool.

Operations for which the power tool was not designed

may create a hazard and cause personal injury.

• Do not use accessories which are not specically

designed and recommended by the tool manufac-

turer. Just because the accessory can be attached

to your power tool, it does not assure safe operation.

• The rated speed of the accessory must be at

least equal to the maximum speed marked on

the power tool. Accessories running faster than their

rated speed can break and y apart.

• The outside diameter and the thickness of your

accessory must be within the capacity rating of

your power tool. Incorrectly sized accessories can-

not be adequately guarded or controlled.

• Threaded mounting of accessories must match

the grinder spindle thread. For accessories

mounted by anges, the arbour hole of the ac-

cessory must t the locating diameter of the

ange. Accessories that do not match the mounting

hardware of the power tool will run out of balance,

vibrate excessively and may cause loss of control.

• Do not use a damaged accessory. Before each

use inspect the accessory such as abrasive

wheels for chips and cracks, backing pad for

cracks, tear or excess wear, wire brush for loose

or cracked wires. If power tool or accessory is

dropped, inspect for damage or install an undam-

aged accessory. After inspecting and installing

an accessory, position yourself and bystanders

away from the plane of the rotating accessory and

run the power tool at maximum no-load speed

for one minute. Damaged accessories will normally

break apart during this test time.

• Wear personal protective equipment. Depending

on application, use face shield, safety goggles or

safety glasses. As appropriate, wear dust mask,

hearing protectors, gloves and workshop apron

capable of stopping small abrasive or workpiece

fragments. The eye protection must be capable of

stopping ying debris generated by various opera-

tions. The dust mask or respirator must be capable

of ltrating particles generated by your operation.

Prolonged exposure to high intensity noise may

cause hearing loss.

• Keep bystanders a safe distance away from

work area. Anyone entering the work area must

wear personal protective equipment. Fragments

of workpiece or of a broken accessory may y away

and cause injury beyond immediate area of operation.

• Hold the power tool by insulated gripping surfac-

es only, when performing an operation where the

cutting tool may contact hidden wiring. Contact

with a "live" wire may also make exposed metal parts

of the power tool "live" and could give the operator

an electric shock.

• Never lay the power tool down until the acces-

sory has come to a complete stop. The spinning

accessory may grab the surface and pull the power

tool out of your control.

• Do not run the power tool while carrying it at your

side. Accidental contact with the spinning accessory

could snag your clothing, pulling the accessory into

your body.

• Regularly clean the power tool’s air vents. The

motor’s fan will draw the dust inside the housing

and excessive accumulation of powdered metal may

cause electrical hazards.

• Do not operate the power tool near ammable

materials. Sparks could ignite these materials.

• Do not use accessories that require liquid cool-

ants. Using water or other liquid coolants may result

in electrocution or shock.

Kickback and Related Warnings

Kickback is a sudden reaction to a pinched or snagged

rotating wheel, backing pad, brush or any other acces-

sory. Pinching or snagging causes rapid stalling of the

rotating accessory which in turn causes the uncon-

trolled power tool to be forced in the direction opposite

of the accessory’s rotation at the point of the binding.

For example, if an abrasive wheel is snagged or

pinched by the workpiece, the edge of the wheel that

is entering into the pinch point can dig into the surface

of the material causing the wheel to climb out or kick

out. The wheel may either jump toward or away from

the operator, depending on direction of the wheel’s

movement at the point of pinching. Abrasive wheels

may also break under these conditions.

Kickback is the result of power tool misuse and/or in-

correct operating procedures or conditions and can be

avoided by taking proper precautions as given below.

• Maintain a rm grip on the power tool and posi-

tion your body and arm to allow you to resist

kickback forces. Always use auxiliary handle, if

provided, for maximum control over kickback or

torque reaction during start-up. The operator can

control torque reactions or kickback forces, if proper

precautions are taken.

• Never place your hand near the rotating acces-

sory. Accessory may kickback over your hand.

• Do not restart the cutting operation in the work-

piece. Let the wheel reach full speed and care-

fully re-enter the cut. The wheel may bind, walk

up or kickback if the power tool is restarted in the

workpiece."

• Support panels or any oversized workpiece to

minimize the risk of wheel pinching and kickback.

Large workpieces tend to sag under their own weight.

Supports must be placed under the workpiece near

the line of cut and near the edge of the workpiece on

both sides of the wheel.

• Use extra caution when making a “pocket cut”

into existing walls or other blind areas. The pro-

truding wheel may cut gas or water pipes, electrical

wiring or objects that can cause kickback.

Safety Warnings Specic for Sanding Operations:

• Do not use excessively oversized sanding disc

paper. Follow manufacturers recommendations,

when selecting sanding paper. Larger sanding

paper extending beyond the sanding pad presents a

laceration hazard and may cause snagging, tearing

of the disc or kickback.

Safety Warnings Specic for Wire Brushing Op-

erations:

• Be aware that wire bristles are thrown by the

brush even during ordinary operation. Do not

overstress the wires by applying excessive load

to the brush. The wire bristles can easily penetrate

light clothing and/or skin.

• If the use of a guard is recommended for wire

brushing, do not allow any interference of the

wire wheel or brush with the guard. Wire wheel

or brush may expand in diameter due to work load

and centrifugal forces.

Additional Safety Warnings

• Maintain labels and nameplates. These carry im-

portant information. If unreadable or missing, contact

a MILWAUKEE service facility for a free replacement.

•

WARNING

Some dust created by power sanding,

sawing, grinding, drilling, and other

construction activities contains chemicals known to

cause cancer, birth defects or other reproductive

harm. Some examples of these chemicals are:

• lead from lead-based paint

• crystalline silica from bricks and cement and other

masonry products, and

• arsenic and chromium from chemically-treated lumber.

Your risk from these exposures varies, depending on

how often you do this type of work. To reduce your

exposure to these chemicals: work in a well ventilated

area, and work with approved safety equipment, such

as those dust masks that are specially designed to

lter out microscopic particles.

SPECIFICATIONS

Volts .............................................................. 18 DC

Battery Type .................................................M18™

Charger Type ................................................M18™

Recommended Ambient

Operating Temperature ......................0°F to 125°F

Cat. No. ..................................................... 2780-20

Rated RPM .....................................................8 500

Spindle Thread Size .................................... 5/8"-11

Max Capacity ............................................... 5"x1/4"

Cat. No. ..................................................... 2781-20

Rated RPM .....................................................8 500

Spindle Thread Size .................................... 5/8"-11

Max Capacity ............................................... 5"x1/4"

• Do not position your body in the area where

power tool will move if kickback occurs. Kickback

will propel the tool in direction opposite to the wheel’s

movement at the point of snagging.

• Use special care when working corners, sharp

edges etc. Avoid bouncing and snagging the ac-

cessory. Corners, sharp edges or bouncing have a

tendency to snag the rotating accessory and cause

loss of control or kickback.

• Do not attach a saw chain woodcarving blade or

toothed saw blade. Such blades create frequent

kickback and loss of control.

Safety Warnings Specic for Grinding and Abra-

sive Cutting-Off Operations:

• Use only wheel types that are recommended for

your power tool and the specic guard designed

for the selected wheel. Wheels for which the power

tool was not designed cannot be adequately guarded

and are unsafe.

• The grinding surface of centre depressed wheels

must be mounted below the plane of the guard lip.

An improperly mounted wheel that projects through

the plane of the guard lip cannot be adequately

protected.

• The guard must be securely attached to the power

tool and positioned for maximum safety, so the

least amount of wheel is exposed towards the

operator. The guard helps to protect the operator

from broken wheel fragments, accidental contact

with wheel and sparks that could ignite clothing.

• Wheels must be used only for recommended

applications. For example: do not grind with the

side of cut-off wheel. Abrasive cut-off wheels are

intended for peripheral grinding, side forces applied

to these wheels may cause them to shatter.

• Always use undamaged wheel anges that are of

correct size and shape for your selected wheel.

Proper wheel anges support the wheel thus reducing

the possibility of wheel breakage. Flanges for cut-off

wheels may be different from grinding wheel anges.

• Do not use worn down wheels from larger power

tools. Wheel intended for larger power tool is not

suitable for the higher speed of a smaller tool and

may burst.

Additional Safety Warnings Specic for Abrasive

Cutting-Off Operations:

• Do not “jam” the cut-off wheel or apply excessive

pressure. Do not attempt to make an excessive

depth of cut. Overstressing the wheel increases

the loading and susceptibility to twisting or binding

of the wheel in the cut and the possibility of kickback

or wheel breakage.

• Do not position your body in line with and behind

the rotating wheel. When the wheel, at the point of

operation, is moving away from your body, the pos-

sible kickback may propel the spinning wheel and

the power tool directly at you.

• When wheel is binding or when interrupting a cut

for any reason, switch off the power tool and hold

the power tool motionless until the wheel comes

to a complete stop. Never attempt to remove the

cut-off wheel from the cut while the wheel is in

motion otherwise kickback may occur. Investigate

and take corrective action to eliminate the cause of

wheel binding.

SYMBOLOGY

Volts

Direct Current

Rated Revolutions per Minute (RPM)

UL Listing Mark for Canada and the U.S.

FUNCTIONAL DESCRIPTION

1. Spindle lock

2. Handle

3. Dust screen

4. Switch lock-off (2780-20)

5. Paddle switch (2780-20)

Slide switch (2781-20)

6. Side handle

Cat. No. 2780-20

7. Guard

8. Accessory

9. Guard lock lever

Cat. No.

2781-20

ASSEMBLY

WARNING

Recharge only with the charger

specied for the battery. For spe-

cic charging instructions, read the operator’s

manual supplied with your charger and battery.

Removing/Inserting the Battery

To remove the battery, push in the release buttons

and pull the battery pack away from the tool.

WARNING

Always remove battery pack before

changing or removing accessories.

To insert the battery, slide the pack into the body

of the tool. Make sure it latches securely into place.

WARNING

To reduce the risk of injury when

grinding, always use properly in-

stalled guards.

Removing/Installing/Adjusting the Guard

This tool is shipped with a guard. Always use a guard

unless otherwise indicated by these instructions.

1. To remove the guard, remove the battery pack

and remove any accessories from spindle.

2. Press in the guard lock lever and rotate the guard

to line up the tabs on the grinder with the slots in

the guard.

3. Press in the lock lever and lift the guard straight

up and away from the tool.

4. To install the guard, remove the battery pack and

remove any accessories from the spindle.

NOTE: Use only 4-1/2" grinding wheels with 4-1/2"

guards (available as an accessory). Use only 5"

grinding wheels with 5" guards.

5. Line up the tabs on the grinder with the slots in

the guard.

6. Press in the guard lock lever and press the guard

onto the tool.

7. To adjust the guard, press in the guard lock lever

and rotate the guard to one of ve detent slots.

WARNING! Always adjust the guard to provide the

operator with maximum protection while operating.

Operator's Zones

WARNING

To reduce the risk of injury, always

use a side handle when using this

tool. Hold securely.

Installing Side Handle

The side handle may be installed on either side of

the gear case. Position the side handle in the loca-

tion which offers best control and guard protection.

To install, thread side handle into side handle socket

and tighten securely.

WARNING

To reduce the risk of injury, the

operator should be instructed in

the use, care and protection of grinding wheels.

Grinding Wheel Selection

Use grinding wheels, and accessories that are:

• correct size as written on tool’s nameplate.

• rated at or above the RPM listed on the tool’s name-

plate.

• correct accessory, wheel type and grit for the job.

Grinding is the cutting action of thousands of abrasive

grains on the face of a grinding wheel. When grinding

metals such as steel and iron, choose an aluminum

oxide grinding wheel. Select a silicon carbide grinding

wheel for stone and concrete. Use cotton reinforced

wheels for non-ferrous metals.

Type 1 Reinforced 1/8" thick or less Cut-Off Wheels

are suited for small cut-off and shallow notching

operations only. Always handle wheels carefully to

avoid damage. Before installing any wheel, always

inspect it for cracks. If wheel is cracked, discard it to

prevent others from using it.

Care of Grinding & Cut-Off Wheels

Grinding/cut-off wheels should be protected from:

• wetness and extreme humidity

• any type of solvent

• extreme changes in temperature

• dropping and bumping

Grinding and cut-off wheels should be stored:

• in an organized way so wheels can be removed

without disturbing or damaging other wheels

• with their safety information

Grinding and cut-off wheels should NOT be dropped,

rolled or bumped.

Discard wheels that have been dropped, rolled,

bumped, subjected to extreme changes in tempera-

ture, or come into contact with solvents or wetness.

WARNING

Only use accessories with Maxi-

mum Safe Operating Speed rated

at least equal to the maximum speed marked on

the power tool. This speed is based on the

strength of the wheel, allowing for a reasonable

measure of safety. It is not meant to imply a best

or most efcient operating speed. Do not exceed

the Maximum Safe Operating Speed.

Installing/Removing Grinding Wheels

Make sure the wheel does not extend beyond the

bottom of the guard. Threaded hub grinding wheels

may require a deeper guard (see "Accessories").

1. Remove the battery pack. WARNING! Always

remove battery pack before changing or removing

accessories.

2. Properly position the guard.

3. Wipe the ange, ange nut and spindle to remove

dust and debris. Inspect the parts for damage. Re-

place if needed. Use only MILWAUKEE mounting

hardware designed for your tool.

4. Place the ange on spindle, as shown.

Spindle

Flange

Wheel

Flange nut

5. Place the selected wheel on the spindle and align

it with the ange.

6. Position the ange nut over the spindle according

to wheel thickness.

Flange nut

position for

1/8" thick or less wheels

1/8"

1/4"

Flange nut

position for

1/4" thick or more wheels

7. Press in the spindle lock button while turning the

ange nut clockwise. Tighten securely.

8. To remove wheel, remove the battery pack and

reverse the procedure.

Sanding Disc Selection

Use sanding discs and accessories that are:

• correct size as written on tool’s nameplate.

• rated at or above the RPM listed on the tool’s name-

plate.

• correct accessory, wheel type and grit for the job.

Select the correct type of sanding disc for your job.

Generally, use 24 or 36 grit for heavy stock removal;

50, 60, or 80 grit for medium stock removal and 120

grit for nishing. Always begin with a coarse grit, us-

ing successively ner grits to obtain the desired nish.

•Aluminum Oxide: For fast cutting, general purpose

discs for most metal jobs. Best for cold-rolled steel,

stainless steel or metals requiring tough, fast cutting,

long lasting abrasives.

•Aluminum Zirconia Bi-Cut: Unique grit pattern is

arranged in clusters for faster stock removal and

cleaning. Ideal for removing paint from cars, boats,

etc. without clogging.

•Ceramic: Lasts up to 3 times longer than Aluminum

Oxide Discs. For general metal working. Ideal for

tough jobs.

Installing Backing Pad and Sanding Discs

1. Remove the battery pack. WARNING! Always

remove battery pack before changing or removing

accessories.

2. Wipe the accessories, disc nut and spindle to

remove dust and debris. Inspect the parts for dam-

age. Replace if needed. Use only MILWAUKEE

mounting hardware designed for your tool.

3. Slip backing pad onto spindle with at side away

from gear case.

4. Place sanding disc on backing pad and secure

assembly to spindle with disc nut.

Spindle

Backing pad

Disc nut

Sanding disc

5. Press in the spindle lock button while turning ange

nut clockwise. Tighten securely.

6. To remove backing pad and sanding disc, remove

the battery pack and reverse the procedure.

Installing/Removing/Cleaning

the Dust Screen

Using the dust screen will increase the performance

and extend the life of the tool.

1. To attach the dust screen, snap the screen over

the tool’s handle.

2. To remove the dust screen, insert a at screw-

driver into the notch at the top of the dust screen

and pry away from the tool.

3. To clean the dust screen, tap against a hard sur-

face, or blow clean with compressed air.

OPERATION

WARNING

To reduce the risk of injury, always

wear safety goggles or glasses

with side shields. Never grind without proper

safety equipment.

Controlled Start

The controlled start feature reduces the torque reac-

tion "jerk" when the trigger is pulled.

WARNING

Always hold the tool rmly with

both hands using the handles

provided before and during grinding.

Paddle Switch Operation (2780-20)

To start the tool, grasp the handle and side handle

rmly. Push the lock-off button forward and squeeze

the paddle switch.

To stop the tool, release the paddle switch. Make

sure the tool comes to a complete stop before laying

down the tool.

Slide Switch Operation (2781-20)

To start the tool, grasp the handle and side handle

rmly and slide the switch to ON.

To stop the tool, release the switch. Make sure the

tool comes to a complete stop before laying down

the tool.

To lock-on the switch, slide the switch to ON and

press down on the front of the switch. To stop the

tool, press and release the switch. Make sure the tool

comes to a complete stop before laying down the tool.

General Operation

1. If you have just installed an accessory or are be-

ginning a period of work, test the wheel by letting it

spin for one minute before applying it to the work-

piece. WARNING! Never use a accessory that has

been dropped. Out-of-balance or damaged acces-

sories can mar workpiece, damage the tool, and

cause stress that may cause accessory failure.

2. Use a clamp, vise or other practical means to hold

your work, freeing both hands to control the tool.

3. WARNING! Hold tool securely with both hands.

Start the tool.

NOTE: If the battery is inserted when the tool is

ON, the tool will not run. Turn the tool OFF, then

back ON to begin work.

4. Allow accessory to come to full speed before

beginning work.

5. Control pressure and surface contact between ac-

cessory and workpiece. WARNING! Never bang

accessory onto work.Too much pressure causes

accessory failure or slows speed.

6. When nished, turn off the tool and make sure it

comes to a complete stop before laying it down.

Using Grinding Wheels

WARNING

The guard type must match the

wheel type to provide maximum

protection for the operator if the wheel should

break.

When grinding, hold tool at a 5

to 15

angle, using

constant pressure for a uniform nish. Too great an

angle causes concentrated pressure on small areas

which may gouge or burn work surface.

For best result use only this portion of disc

Hold at a

5° to 15° angle

Using Cut-Off Wheels

Cut-Off Wheels are suited for small cut-off and shal-

low notching operations only.

WARNING

The guard type must match the

wheel type to provide maximum

protection for the operator if the wheel should

break.

When using a cut-off wheel, hold the tool as shown,

using only the edge of the wheel. WARNING! Using

the face of a Cut-Off Wheel (as in grinding) will cause

the Wheel to crack and break, resulting in serious

personal injury.

Using Wire Brushes

Wire brushes are useful for removing rust, scale,

burrs, weld slag, etc.

WARNING

Everyone in the area must wear

protective clothing and safety

goggles or face shields. Fatigued wires and

residue will y off the brush with considerable

force, causing potential for serious injury.

Never exceed Maximum Safe Operating Speed of

brush. Do not use a damaged brush or one that

is functioning improperly (throwing wires, out-

of-balance, etc.). These conditions increase the

possibility of further brush failure and possible

injury. Discard and replace damaged brushes

immediately.

A Type "27" guard must be installed when using

a wire wheel brush to provide maximum protec-

tion for the operator when fatigued wires break.

(See "Removing/Installing/Adjusting the guard".)

Always install wire brushes according to the acces-

sory manufacturer’s instructions. Only use acces-

sories with threads matching the tool spindle.

Wire Wheel Brush

Guard

Wire Cup Brush

Test wheel for balance and loose or damaged wires

by letting it spin for one minute before applying it to

the workpiece. During this time, no one should stand

in front of or in line with it.

Control pressure and surface contact between

wheel and workpiece. Too much pressure causes

over-bending of wires and heat build-up causing

premature wire breaking, rapid dulling and reduced

brush life. Instead of more pressure, try a wire wheel

with more aggressive cutting action (increased wire

size, decreased wire length or different brush type

(knot type vs. crimped wire type).

Using Sanding Discs

Hold tool at 5° to 15° angle to ensure proper sanding

pressure and control. Too great an angle will result

in too much pressure and could cause excessive

wear to the disc and workpiece. Too small an angle

will reduce control.

Use long, sweeping, side to side strokes, advancing

forward to produce the desired nish.

For best result use only this portion of disc

Hold at a

5° to 15° angle

Cross Sanding - When nishing a surface that

has been prepared by a coarse disc or wheel, sand

at right angles to the strokes made by the coarser

disc. Finishing marks left from previous sanding are

easily seen and removed for a uniform nish. Failure

to cross sand when changing from a coarse disc to

a nishing disc may result in deep scratches and

circular marks.

Removing Welds or Hammer Marks - When remov-

ing welds or hammer marks, limit coarse sanding to

the immediate area. Use successively ner grits to

smooth surface.

Finishing Metal - Constantly move across the sur-

face. Work faster on curved surfaces where contact

areas are smaller and pressure is greater. Flat areas

may appear at the end of the stroke when pressure

is too heavy. Ease up on pressure at end of each

stroke and when reversing strokes.

Troubleshooting

Deep scratches and circular marks can result from:

• Using too coarse a grit

• Using a partially glazed disc

• Dirt or loose metal on the workpiece

• Failure to sand across the grain when changing from

coarse to nishing discs

• Failure to use closed coated discs to reduce the

problem of grains working loose and scratching the

workpiece

Bluish discoloration of metal surface indicates:

• Excessive heat caused by circular motion in a small area

• Excessive pressure

• Use of worn out or glazed discs

MAINTENANCE

WARNING

To reduce the risk of injury, always

unplug the charger and remove the

battery pack from the charger or tool before

performing any maintenance. Never disassemble

the tool, battery pack or charger. Contact a

MILWAUKEE service facility for ALL repairs.

Maintaining Tool

Keep your tool, battery pack and charger in good

repair by adopting a regular maintenance program.

Inspect your tool for issues such as undue noise,

misalignment or binding of moving parts, breakage of

parts, or any other condition that may affect the tool

operation. Return the tool, battery pack, and charger

to a MILWAUKEE service facility for repair. After six

months to one year, depending on use, return the

tool, battery pack and charger to a MILWAUKEE

service facility for inspection.

If the tool does not start or operate at full power with

a fully charged battery pack, clean the contacts on

the battery pack. If the tool still does not work prop-

erly, return the tool, charger and battery pack, to a

MILWAUKEE service facility for repairs.

WARNING

To reduce the risk of personal in-

jury and damage, never immerse

your tool, battery pack or charger in liquid or

allow a liquid to ow inside them.

Cleaning

Clean dust and debris from vents. Keep handles

clean, dry and free of oil or grease. Use only mild

soap and a damp cloth to clean, since certain clean-

ing agents and solvents are harmful to plastics and

other insulated parts. Some of these include gasoline,

turpentine, lacquer thinner, paint thinner, chlorinated

cleaning solvents, ammonia and household deter-

gents containing ammonia. Never use ammable or

combustible solvents around tools.

Repairs

For repairs, return the tool, battery pack and charger

to the nearest service center.

ACCESSORIES

WARNING

Use only recommended accesso-

ries. Others may be hazardous.

For a complete listing of accessories, go online to

www.milwaukeetool.com or contact a distributor.

SERVICE - UNITED STATES

1-800-SAWDUST (1.800.729.3878)

Monday-Friday, 7:00 AM - 6:30 PM CST

or visit www.milwaukeetool.com

Contact Corporate After Sales Service Technical

Support with technical, service/repair, or warranty

questions.

Email: [email protected]

Become a Heavy Duty Club Member at

www.milwaukeetool.com to receive important

notications regarding your tool purchases.

SERVICE - CANADA

Milwaukee Tool (Canada) Ltd

1.800.268.4015

Monday-Friday, 7:00 AM - 4:30 PM CST

or visit www.milwaukeetool.ca

LIMITED WARRANTY

USA & CANADA

Every MILWAUKEE power tool* (see exceptions below) is warranted

to the original purchaser only to be free from defects in material and

workmanship. Subject to certain exceptions, MILWAUKEE will repair

or replace any part on an electric power tool which, after examination,

is determined by MILWAUKEE to be defective in material or workman-

ship for a period of ve (5) years** after the date of purchase unless

otherwise noted. Return of the power tool to a MILWAUKEE factory

Service Center location or MILWAUKEE Authorized Service Station,

freight prepaid and insured, is required. A copy of the proof of purchase

should be included with the return product. This warranty does not

apply to damage that MILWAUKEE determines to be from repairs

made or attempted by anyone other than MILWAUKEE authorized

personnel, misuse, alterations, abuse, normal wear and tear, lack of

maintenance, or accidents.

Normal Wear: Many power tools need periodic parts replacement and

service to achieve best performance. This warranty does not cover

repair when normal use has exhausted the life of a part including,

but not limited to, chucks, brushes, cords, saw shoes, blade clamps,

o-rings, seals, bumpers, driver blades, pistons, strikers, lifters, and

bumper cover washers.

*This warranty does not cover Air Nailers & Staplers; Airless Paint

Sprayer; Cordless Battery Packs; Gasoline Driven Portable Power

Generators; Hand Tools; Hoist – Electric, Lever & Hand Chain;

M12™ Heated Gear; Reconditioned Product; and Test & Measure-

ment Products. There are separate and distinct warranties available

for these products.

**The warranty period for Job Site Radios, M12™ Power Port, M18™

Power Source, Jobsite Fan and Trade Titan™ Industrial Work Carts

is one (1) year from the date of purchase. The warranty period for the

Cables for the Drain Snake is two (2) years from the date of purchase.

The warranty period for the LED in the LED Work Light and the LED

Upgrade Bulb for the Work Light is the lifetime of the product subject

to the limitations above. If during normal use the LED or LED Bulb

fails, the part will be replaced free of charge.

Warranty Registration is not necessary to obtain the applicable war-

ranty on a MILWAUKEE power tool product. The manufacturing date

of the product will be used to determine the warranty period if no proof

of purchase is provided at the time warranty service is requested.

ACCEPTANCE OF THE EXCLUSIVE REPAIR AND REPLACEMENT

REMEDIES DESCRIBED HEREIN IS A CONDITION OF THE CON-

TRACT FOR THE PURCHASE OF EVERY MILWAUKEE PRODUCT.

IF YOU DO NOT AGREE TO THIS CONDITION, YOU SHOULD NOT

PURCHASE THE PRODUCT. IN NO EVENT SHALL MILWAUKEE BE

LIABLE FOR ANY INCIDENTAL, SPECIAL, CONSEQUENTIAL OR

PUNITIVE DAMAGES, OR FOR ANY COSTS, ATTORNEY FEES,

EXPENSES, LOSSES OR DELAYS ALLEGED TO BE AS A CON-

SEQUENCE OF ANY DAMAGE TO, FAILURE OF, OR DEFECT IN

ANY PRODUCT INCLUDING, BUT NOT LIMITED TO, ANY CLAIMS

FOR LOSS OF PROFITS. SOME STATES DO NOT ALLOW THE EX-

CLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL

DAMAGES, SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT

APPLY TO YOU. THIS WARRANTY IS EXCLUSIVE AND IN LIEU

OF ALL OTHER EXPRESS WARRANTIES, WRITTEN OR ORAL.

TO THE EXTENT PERMITTED BY LAW, MILWAUKEE DISCLAIMS

ANY IMPLIED WARRANTIES, INCLUDING WITHOUT LIMITATION

ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS

FOR A PARTICULAR USE OR PURPOSE; TO THE EXTENT SUCH

DISCLAIMER IS NOT PERMITTED BY LAW, SUCH IMPLIED WAR-

RANTIES ARE LIMITED TO THE DURATION OF THE APPLICABLE

EXPRESS WARRANTY AS DESCRIBED ABOVE. SOME STATES

DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WAR-

RANTY LASTS, SO THE ABOVE LIMITATION MAY NOT APPLY TO

YOU, THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS,

AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM

STATE TO STATE.

This warranty applies to product sold in the U.S.A. and Canada only.

Please consult the ‘Service Center Search’ in the Parts & Service

section of MILWAUKEE’s website www.milwaukeetool.com or call

1.800.SAWDUST (1.800.729.3878) to locate your nearest service

facility for warranty and non-warranty service on a MILWAUKEE

electric power tool.

LIMITED WARRANTY - MEXICO,

CENTRAL AMERICA & CARIBBEAN

TECHTRONIC INDUSTRIES' warranty is for 5 year since the original

purchase date.

This warranty card covers any defect in material and workmanship

on this Power Tool.

To make this warranty valid, present this warranty card, sealed/

stamped by the distributor or store where you purchased the product,

to the Authorized Service Center (ASC). Or, if this card has not been

sealed/stamped, present the original proof of purchase to the ASC.

Call toll-free 1 800 832 1949 to nd the nearest ASC, for service, parts,

accessories or components.

Procedure to make this warranty valid

Take the product to the ASC, along with the warranty card sealed/

stamped by the distributor or store where you purchased the product,

and there any faulty piece or component will be replaced without

cost for you. We will cover all freight costs relative with this warranty

process.

Exceptions

This warranty is not valid in the following situations:

a) When the product is used in a different manners from the end-user

guide or instruction manual.

b) When the conditions of use are not normal.

c) When the product was modied or repaired by people not authorized

by TECHTRONIC INDUSTRIES.

Note: If cord set is damaged, it should be replaced by an Authorized

Service Center to avoid electric risks.

SERVICE AND ATTENTION CENTER:

Presidente Masarik No.29 Piso 7, Col. Polanco V Sección

Miguel Hidalgo C.P.11560 Mexico, DF.

Ph. 52 55 4160-3547

IMPORTED AND COMMERCIALIZED BY:

TECHTRONIC INDUSTRIES MEXICO, .S.A. DE C.V.

Presidente Masarik No.29 Piso 7, Col. Polanco V Sección

Miguel Hidalgo C.P.11560 Mexico, DF.

Model:

Date of Purchase:

Distributor or Store Stamp:

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Milwaukee 2780-20 User manual

Brand: Milwaukee

Model: 2780-20

Category: Power tools

Type: User manual

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